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v3.21.2

CONTRACTS AND AGREEMENTS - Additional Information (Details) | 9 Months Ended
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Sep. 30, 2021 USD ($)
Maximum [Member] |
Commission per round turn | $ 8
Minimum [Member] |
Commission per round turn | $ 7
Marketing Agreement [Member] | BNO's assets up to $3 billion [Member] |
Fee percentage | 0.06%
Marketing Agreement [Member] | BNO's assets up to $3 billion [Member] | Maximum [Member] |
Base amount for determining fee percentage | $ 3,000,000,000
Marketing Agreement [Member] | BNO's assets in excess of $3 billion [Member] |
Fee percentage | 0.04%
Marketing Agreement [Member] | BNO's assets in excess of $3 billion [Member] | Maximum [Member] |
Fee percentage | 10.00%
Marketing Agreement [Member] | BNO's assets in excess of $3 billion [Member] | Minimum [Member] |
Base amount for determining fee percentage | $ 3,000,000,000

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- Definition Base Fee Percentage + References No definition available. + Details
Name: | bno_BaseFeePercentage
Namespace Prefix: | bno_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Basis Amount for Fee Percentage + References No definition available. + Details
Name: | bno_BasisAmountForFeePercentage
Namespace Prefix: | bno_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents the commissions round turn trade including exchange fees. + References No definition available. + Details
Name: | bno_CommissionPerRoundTurn
Namespace Prefix: | bno_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_TypeOfArrangementAxis=bno_MarketingAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=bno_GroupFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=bno_GroupFiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |